Chine co



July 9, 1929. L. .1. PARKER TELESCOPIC PUNCH FOR FORMING TUBES Filed Aug. 26, 1927 5 Sheets-Sheet 2 V E Lam JPa -ker QQZUWX/ Z76.

July 9, 1929. L. J. PARKER TELESCOPIC PUNCH FOR FORMING TUBES Filed Aug. 26 1927 3 Sheets-Sheet 5 R u E V Patented my 9, 192a.

UNI ED; T E

[1,720,315 PATENT "OFFICE.

LARS J'. PARKER, OF CHICAGO, ILLDIOIS, ASSIGNOR 'IO QUALITY HARDWARE &: MIA- CHINE CO A COPABTNERSHIP CONSISTING OF JERRY ANDERSON, H. A; LAYS'I'ROM,

C.- A, LAYSTROH, CARL BCHWABTZ MRS. LOUISA ELSE 'LAYS'I'BOH, AND EVELYN PETERSON;

LAYSTBOM, FRANK LINDGREN,

TELESCOPIC PUNCH FOR FORMING TUBES.

Application filed August 26, 1927. Serial No. 215,556.

This invention relates to pressure apply.- I

7 provide a punch adapted to the production of closed elongated tubes from shallow metal forms or on s ina single operation.

It is another ohject of this invention to lo provide a punch having sliding members in telescopic relation adapted to offer a ser1es of stepped pressure applying faces as the punch progresses through a die holder to produce an article of a desired shape 1n a 115 single operation.

" It is a further important objectof this .invention to provide a punch or pressure applying device having a plurality of slidalole members which are locked together to provide a pressure applying face of a desired area when the face engages with material to hetormed and to unlock the members in predetermined sequence to; provide a face of decreasing area as the device progresses into a die holder to produce an article of a desired shape in'a single operation.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accomanyin drawin s. 39 P This inven'tio (in a preferred form) is illustrated in the drawings and hereinafter "more fully described.

(in the drawings:

Figure 1 is a side elevation of the device with the die holder and dies in-section and shows the punch engaging the cup in the initial step of the forming operation.

Figure 2 is a side elevation of the device y with the die holder and dies in section and shows the punch engaging the material to be formed in an intermediate step of the forming operation. a

Figure 3 is a sectional view of line t lllI-III ofFigure 1.

Figure 4 is a sectional view on line Il -IV of Figure 3.

Figure 5 is a sectional view on line V--V of Figure 3. hill of Figure 5.

Fi re 7 is a sectional view on line VII-VII f Figure 5.

Figure 8. 5 It is a primary-object of'this invention to Figure 6 is a sectional view on line VI-VI Figure '8 is a plan view of the base of the dleholder showmg the stripper plates.

Figure 9 is a section on line IX-JXof Asshown on the drawings:

The numeral 10 indicates a shank or stem having a shoulder 11 formed by an enlarged portion 12. Pressure may be applied to the shank 10 at its upper enlarged portion 14 by any suitable means. The shank 10 is apertured as at 15 to seat a ball 17. The upperportion of the seat is cutaway as shown at 16 in Figures 4 and 5 to promote unseating of the ball 17 when such unseating is proper as will be discussed later.

A sleeve 18 having a shoulder 19 formed on the upper endthereof is slidable on the shank 10..

The sleeve 18 has an inclined aperture indicated at .20 in Figure 5 alignable with the aperture 15 in the shank 10 to house the ball 17. A slot 23 in the sleeve 18 is aligned with a slot 21 in the shank 10 and a key 22 feathers in the slots 21 and 23 to retain the housed in the apertures 15 and 20; The

sleeve 18 is also apertured at 24 on Figure 4 to seat the ball 25, for a purpose that will appear later. The aperture 24 is cut away to promote the unseating of the ball seated in it, when the occasion for unseating arises as will be discussed when the the device is gone into.

A second sleeve 26 having a shoulder 27 formed thereon at its upper end is slidable on the sleeve 18. It will be noted that the sleeve 26 closes the ball housing aperture 20 in the sleeve 18 as indicated at 28 in Figure 5, and in doing so enables the ball 17 to hold the shank 10 and the sleeve 18 in locked engagement.

It will also be noted that an aperture 29 in the sleeve 26 is capable of aligmnent with the aperture 15 in t e sleeve 18 so that the .ball 17 may roll or be expelled into the operation of member 44 acting through lllli I understood scends below 'the stripping fingers 61, the fingers move forwar to retam, the tube when the punch is withdrawn from the die holder.

As the punch ascends the sleeves fall into locked engagement with each other and with the stem so that at the endof the upward stroke the pressure applying face has the area it had at the beginning of the downward stroke.

It will be obvious that with the release of downward pressure-on the shank when the punch is about to be retractedthe spring the pin 43 on the shoulder 42 will cause a slight lifting pf the sleeves and encourage the free movement of the balls in the several apertures as the punch is retracted.

The conduit formed inthe stem permits the escape of air from the formed material as the punch descends into it. It will be that the device is not limited to the application shown in the drawings, and

' that the initial area of the pressure applying face may be changed by the simple expedient of unlocking one or more of the outer sleeves. p

I am aware that many changes may be made, and numerous details of construction may be varied through a wide range without departing from the principles of this invention and I therefore-do not purpose limiting the patent granted hereon, otherwise than necessitated by the prior art.

I claim as my invention:

1. A portable telescopic punch adapted to draw a blank of metal in a stepped die, the punch comprising a-jcenter rod member, a plurality of overlying concentric sleeves in sliding engagement on the rod member, a collar slidable on the outermost sleeve, interlocking means adapted to retain the sleeves and the rod in assembled locked rela'- tion, the said collar being adapted to engage an abutting surface onthe die after t e punch has entered a predetermined distance therein to release certain of said interlocking means and thereby ermit relative motion of the sleeves and the rod member in a predetermined sequence.

7 2. A portable telescopic punch adapted to draw a blank of metal in a stepped die, the

punch comprisin a center rod member, a plurality of overlying concentric sleeves in sliding engagement on the rod member, a collar slidable on the outermost sleeve, interlocking ball means adapted to retain the seeves and the rod in assembled locked relation, the said collar being adapted to engage an abutting surface on the die after the punch has entered a predetermined distance therein torelease certain of the said inter locking ball means and thereby permit relative motion of the sleeves and the rod mem ber in a predetermined se uence.

3. A telescopic punch a apted to draw a blank in a stepped die, the punch comprising a center rod member, a plurality of overlying concentric sleeves in sliding engagement on the rod member, the said rod member having a plurality of elongated recesses and Y the said sleeves having elongated recesses and inclinedly passaged apertures, a collar slidable on the outermost -sleeve, the said collar having an elongated recess, interlocking ball means housed in the sleeves adapted to retain the sleeves and the rod in assembled locked relation, resilient abutment means on one of the said sleeves adapted to abut another of said sleeves when the punch is in the die, the said collar being adapted to engage an abutting surface on the die after the unch has entered a predetermined distance 1n the die to release certain of said inter- LABS J. PARKER.

July 9, 1929.

E. F. PIERCE ET AL LUBRICANT COMPRESSOR Filed June 14, 1924 IL ///////I 

